In the first episode, the first time we see Fish Mooney, she is watching a stand-up comedian try out at her club. He tells a blackly humorous joke and she loves it. Then some violence occurs that he witnesses and he gets scared. Right off the bat I thought it would be him, so when I saw Jerome's first episode I thought they must have changed their minds. Now that we know that Jerome was a little misdirection, I think once again that it is the comedian from Ep 1.